<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <form action="update_User.do" method="post">
        编号：<input type="text" name="userId" th:value="${user.userId}" readonly="readonly"/><br/>
        年龄：<input type="text" name="age" th:value="${user.age}"/><br/>
        密码：<input type="text" name="password" th:value="${user.password}"/><br/>
        用户名：<input type="text" name="userName" th:value="${user.userName}"/><br/>
          <input type="submit" value="提交"/>
    </form>
</body>
</html>